Location: Wasilla, Alaska
Certificates: A&P, Rotorcraft CPL/CFI
Posts: 53
Threads: 11
Joined: Dec 2025
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who's installed a master switch on their ship? my machine came with a physical battery disconnect underneath the passenger seat, i'm wanting to swap it out for a remote electric master relay.
for fault protection and redundancy reasons i still want the alternator to be in parallel so if the battery becomes disconnected in flight the alternator is still producing a charge.
in my head this sounds simple enough, i'm curious who is actually utilizing a master.
Location: Seguin, TX
Certificates: Comm ASEL/RH CFII ASEL/RH Comm GL
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I have. Works great. Standard continuous duty battery disconnect relay. Installed the relay near the battery on the battery box.
Location: Wasilla, Alaska
Certificates: A&P, Rotorcraft CPL/CFI
Posts: 53
Threads: 11
Joined: Dec 2025
Reputation:
18
i'm liking the idea of a latching relay which doesnt take any current to keep its state.
i'm wanting to use one for a EarthX lithium battery install and prevent parasitic drains from external regulators like i have heard of. a battery to bus disconnect just makes sense also.
i am mindful of lithium battery BMS's and battery disconnects can surge an alternators current if disconnected from whatever even shuts if off. so there's a few alternator protection devices out there for this use. Balmar makes one specifically for the use of lithium batteries. Balmar APM-12
i'm working on making my own master wiring diagram for my ship and systems.